Reactance device



Nov. 27, 1928. 1,693,178

s. M. was

REACTANCE DEVICE Filed April 2, 1927 y INVENTOR Z 5. M. Luca aha-MPatented Nov. 27, 1928.

UNITED STATES SAMUEL M. LUCAS, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TOTHE 'UNION SWITCH & SIGNAL COMPANY, SWISSVALE, PENNSYLVANIA, ACORPORATION OF PENNSYLVANIA.

Application filed A an 2,

My invention relates to reactance devices, and particularly to adjustingmeans for such devices.

I will describe two forms of reactance devices embodying my invention,and will then point out the novel features thereof in claims.

In the accompanyin drawing, Fig.1 is a front view with parts brokenaway, showing one form of reactance device embodying my 1 invention.Fig. 2 is aside view of the device shown in Fig. 1. Fig. 3 is a frontview, with parts broken away, showing a modified form of reactancedevice, and also embodying my invention. Fig. 4 is a side View of thedevice shown in Fig. 3. p

Similar reference characters refer to similar parts in each of theseveral views.

Referring first to Figs. 1 and 2 of the drawing,'the-reference characterR designates a 2 reactance device comprising, in the form here shown, acore consisting of a stationary. L- shaped member 1 of magnetizablematerial, preferably laminated, and a movable L- shaped member 2 of thesame material. The member 1 is secured to a support '3 and carries aface plate 4, the three parts being secured to ether by suitable meanssuch as bolts 5. Fxtending from the support 3 are two integral legs 3which are offset at right angles to the support and provide means forattaching the device to a suitable base, openings 6 being provided ineach of these legs to accommodate any suitable fastening means. Themovable member 2 carries two' pins 8 on its upper leg, and these pinsare arranged to co-operate with two inclined slots 9 of suitable shapein the face plate 4 for the purpose of permitting gradual and accurateadjustment of the lengths and argas of the air gaps 11 and 12 betweenthe members 1 and 2. A bolt 10 passing through the support 3 and faceplate 4 is provided for the purpose of clamping the member 2 in itsadjusted position. Carried on the member 1, is a winding I 7 themagnetic circuit of which includes the members 1 and 2 and the air gaps11, and 12.

Thereluctance of this circuit is-adjustable' by varying the lengths andareas of these air 1,693,178 PATENT OFF-ICE.

anacrancn' DEVICE.

1927. Serial No. 180,450.

of the magnetic circuit of winding 7. Such decrease in reluctance willproduce a corresponding increase in the reactance of windmg 7. In asimilar manner, movement of the member 2 from left to right willincrease the length of air gaps 11 and 12, and decrease their areas,thus increasing the reluctance of the magnetic circuit of winding 7.This in crease in reluctance will result in a. decrease in the reactanceof the winding 7 Inasmuch as the reactance of this winding depends uponthe reluctance of its magnetic circuit, it will be seen that thereactance may bevaried by adjusting the member 2 and that by suitablearrangement and shape of the slots 9 and pins 8 such variation may'bemade to take place at any desired predetermined rate. In some cases, forexample, it may be desirable to so arrange the parts that equalincrements of movement of'the member 2 will produce The core 13 ismounted between a suitable support 16 and a face plate 17 and is securedin position between these members by means of bolts 5. The support 16has two integral ofii'set legs 16 provided as a means for attaching thetransformer toasuitable base. A movable block 18 of magnetizablematerial is mounted between the support 16 and the plate 17 and isseparated from the core 13 by two air gaps 19 and 20. Projecting fromthe block 18 are two pins 8 which co-operate with two inclined slots 9of suitable shape cut in the face plate 17 for the purpose of allowingthe lengths and areaso'f air gaps 19and 20 to be varied by changing theposition of the block 18. -A bolt 10-passing through face plate 17 andthe support '16 is provided for the purpose of clamping the block 18 inits adjusted position. Whenthe block 18 is moved from left to right thelengths of the air gaps ,19 and 20 are increased and their areasdecreased, thus increasing the magnetic reluctance of the path throughthe air gaps 19 and 20 and block 18,

' and decreasing the magnetieleakage around secondary winding S. In acorresponding manner, movement of the block 18 from right I to leftdecreases the lengths of the air gaps 19 and 20, and increases theirareas, decreasing the magnetic reluctance of the path through air gaps19 and 20 and block 18 and increasing the magnetic leakage aroundwindingS.

the amount of leakage flux around the secondary winding S may be variedby moving the block 18 and that this block may be clamped in itsadjusted position by means would be produced by a reactor connected inseries with this secondary Winding, and it is therefore evident that bychanging the position of the block 18, the equivalent reactance of thewindings maybe varied by infinitely small degrees to give any desiredadjustment,

which adjustment may be maintained by means of the bolt 10.

It will be apparent from the foregoing,-

that the adjustment whichl provide makes 1t possible to produce, adefinite and predetermined variation in the magnetic leakage of thetransformer quickly and accuratel without the use of complicatedapparatus.

Although I have herein shown and described only two forms ofretractancedevices embodying my invention, it is understood that various changesand modifications may be made'therein within the scope of the appendedclaims without departing from the spirit and scope of my invention.

Having thus described my invention, what I claim is:

1. An adjustable reactance device comprising a" core of magnetizablematerial made up of a fixed portion and a' movableportion, a winding onsaid fixed portion, a plate secured to the fixed portion and havinginclined slots therein, and a plurality of pins in said movable portionco-operating with the slots in said plate for adjusting the" position ofsaid mov- It will, therefore, beclear thatits adjusted position.

portion,- said fixed portion having two parallel legs, a winding on eachof said legs, a support and a plate secured on opposite sides ofsaidcore,'sai.d plate hav' cured to the movable portion of the core forco-operation with the slots in said plate, and

a plurality of inclined slots therein, a plur ity of pins semeans forsecuring the movable portion in n combination, a magnetizable core madeup of a fixed portion having two parallel legs each carrying a windinand a movable portion for varying the eakage flux from one of'saidwindings, a plate secured to said-fixed portion and having a pluralityof inclined slots therein, a plurality of pinsin said movable rtion eachoo-operating with one of the s ots in said plate to allow such movableportionto be adjusted/and means for securing said movable portion in itsadjusted position. v

4. A reactance device comprising a magnetizable core having a fixedportion and a movable portion, a plate secured to said fixed portion andloosely connected to said movable portion by means of inclined slots inone of said parts and pins in the other of said 1 parts, said pins andslots co-operating to adust the position of said movable portion and tovary the reluctance ofsaid core.

5. A. reactance device comprising a magnetizable core made up of a fixedmember and a,movable member, a plate secured to said fixed member,, anadjustable connection between said plate and movable member andcomprising a plurality of inclined slots in one of said parts and aplurality of pins carried by the other of said parts, said pins 00-operating with said slots to vary the position of said movable memberand to vary the re- .actance of said winding.

